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I'm not sure what you mean by "reset" a username. However, you can change usernames like any other field, by updating the user entity (http://devcenter.kinvey.com/rest/guides/users#update).
R
RJF
said
about 9 years ago
If I have a user with a username-password of "rob-12345" will changing either "rob" or "12345" create a different _id or access control value? Just wanted to double check rather than assume.
Gal
said
about 9 years ago
No, the _id of a user can never change, regardless of any updates to the entity's fields.
RJF